EP3379164B1 - Appareil de récupération de chaleur par ventilation mécanique - Google Patents
Appareil de récupération de chaleur par ventilation mécanique Download PDFInfo
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- EP3379164B1 EP3379164B1 EP18162795.1A EP18162795A EP3379164B1 EP 3379164 B1 EP3379164 B1 EP 3379164B1 EP 18162795 A EP18162795 A EP 18162795A EP 3379164 B1 EP3379164 B1 EP 3379164B1
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- mvhr
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/002—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid
- F24F12/003—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid using a heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0057—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground receiving heat-exchange fluid from a closed circuit in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
- F24F2005/0067—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
- F24F2011/0006—Control or safety arrangements for ventilation using low temperature external supply air to assist cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F2012/007—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using a by-pass for bypassing the heat-exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/272—Solar heating or cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Definitions
- the present invention relates to Mechanical Ventilation Heat Recovery (MVHR) system for buildings, particularly but not exclusively domestic buildings.
- MVHR Mechanical Ventilation Heat Recovery
- MVHR systems are energy recovery ventilation systems which use an air-to-air heat exchanger, or Heat Recovery Unit (HRU) which causes the inbound air flowing into the building to exchange heat with the outbound air flowing out of the building, thus providing fresh air inside the building whilst also saving energy by reducing the heating (or cooling) requirement for the inbound air necessary for the interior of the building to be maintained at a comfortable temperature.
- HRU Heat Recovery Unit
- MVHR systems are becoming increasingly prevalent in new buildings and new build houses. Many MVHR systems take advantage of buildings which are designed with a pitched roof, i.e. a roof having at least two pitched slopes; often there is unused space under at least a part of the pitched roof, so that many of the elements of the MVHR system (the HRU, the fans, etc.) can conveniently be placed in this space, and the ducting leading to the inlet for inbound air and to the outlet for exhaust air can also fit into this space. Consequently the inlet and outlet are often located on the pitched slopes, usually on different, often opposite slopes. EP1923643 discloses such a system.
- MVHR systems function by exploiting the difference between ambient temperature outside the building and the desired temperature inside the building. Whilst the desired internal temperature varies little according to season (the normal range of inside air temperatures which are deemed comfortable for humans is between about 16° C and about 22° C), ambient temperature outside the building varies over a much greater range (in the United Kingdom between about -5° C and about 30° C).
- a feature of MVHR systems is that they are essentially static, in that their essential elements are fixed in position (they form part of the building). This means that if the inbound air is drawn from the southerly side of the building, in winter this air is warmer than the air on the northerly side of the house, thus reducing the energy required to raise it to the required internal temperature; however, in summer this inbound air is much warmer than the desired internal temperature, and warmer than the air on the northerly side of the house, thus increasing the energy required to lower it to the required internal temperature.
- air inlets and outlets are located so as to be most efficient at introducing fresh air and removing exhaust air and so as to minimise the noise of the fan(s) which drive the air flows, so reversing the air flows would adversely affect the efficiency of the system, and lead to increased noise. It is also common for the inbound air to pass through a filter system, to remove undesirable dust, pollen, etc. from the inbound air before it enters the building; reversing the flow of air would risk allowing inbound air to entrain these filtered particles and carry them inside the building to the discomfort of the occupants. Further, if the air flows were to be reversed then it would be necessary to provide a second filter system to remove undesirable particles from the inbound air flow when the flow is reversed.
- the present invention therefore provides an MVHR system for a building having at least two large outer surfaces facing in different directions, the MVHR system comprising a Heat Recovery Unit (HRU) for receiving and exchanging heat between a flow of ambient air from outside the building and a flow of building air from within the building, the HRU being connected by fluid flow conduits to first and second ports located on different surfaces of the at least two large outer surfaces facing in different directions, in which a flow diverter is provided in the conduits between the HRU and the ports, the flow diverter being switchable between a first state in which ambient air flows from the first port to the HRU and into the building and building air flows from the HRU to the second port to be exhausted from the building, and a second state in which ambient air flows from the second port to the HRU and into the building and building air flows from the HRU to the first port to be exhausted from the building.
- HRU Heat Recovery Unit
- the inbound and outbound air flows can be reversed upstream of the HRU, and upstream of all other elements of the MVHR system such as filters, fans, etc. so that in operation there is no flow reversal in the majority of the system, and the problems associated with flow reversal described above can be avoided.
- the system can be controlled so as to choose which port to draw inbound air from (namely that where the ambient air temperature requires the least energy to raise or lower it to the desired temperature inside the building) overall energy usage by the MVHR system is reduced. In summer, relatively cool air from the northerly side of the building can be drawn in, and in winter relatively warm air from the southerly side of the building can be drawn in as inbound air.
- the invention saves energy due to significant heating and hot water reduction in (mostly) the spring and autumn months when there is still plenty of sun light but the house needs heating in the evening.
- the building's main heat source which could be any other heat source, such as a gas boiler or an Air Source Heat Pump (ASHP)
- ASHP Air Source Heat Pump
- the system When the system is used for cooling it will of course reduce the temperature in the house and will also reduce the energy demand if there were some sort of active cooling system in the property, but if there is no such cooling system it provides a method of reducing the internal temperature (and has no saving as such indirectly of energy).
- the first and second ports may be located in these two slopes.
- the location of the ports under a pitched roof means that much of the ducting for the air flows to and from the ports can be accommodated in the unused eaves space within the roof.
- the first and second ports may be located in the outer walls on different sides of the building.
- the flow diverter is preferably adapted to switch the flows of ambient and building air between the first and second states simultaneously.
- a simultaneous flow change upstream of the HRU and of the remainder of the MVHR system means that there is no pressure change in the system downstream of the flow diverter which might dislodge dust or other undesirable particles and introduce them into the air flowing into the building, and also minimises noise because the flow diverter can "balance" the instantaneous changes as it operates.
- the flow diverter may incorporate a separate plenum for each flow of air, into and out of the building, to flow through; these plenums acts advantageously as noise attenuators, and can also act as "traps" to supplement any filters for trapping unwanted particles in the inbound air.
- the flow diverter may comprise a generally airtight and cylindrical drum having four ports for air to flow through located on at least one end face of the drum, the drum containing a rotatable vane, the ports being disposed such that rotation of the vane within the drum switches air flows between the first and second states, or vice versa.
- This simple arrangement which is described further below, is simple and inexpensive to manufacture.
- rotary movement of the vane can be in the horizontal plane (i.e. about an essentially vertical axis), which allows the vane to be balanced and minimises the power required to turn it.
- the system may further comprise a sensor for determining the ambient temperature outside the building, and a controller adapted to switch the flow diverter from the first state to the second when the ambient temperature exceeds a first threshold temperature.
- the controller can be adapted to switch the flow diverter from the second state to the first when the ambient temperature is less than a second threshold temperature.
- the system can be set up so as to optimise energy savings according to the wishes of the building's occupants as to an acceptable inside temperature, and according to the prevalent seasonal shift in temperature.
- the first and second threshold temperatures could be the same.
- the Air Source Heat Pump could be an Air Source Heat Pump (ASHP) in the fluid flow conduit between the northerly port and the flow diverter for exchanging heat between ambient air and building air as air either leaves or enters the building.
- the building air is warm in summer when it enters from the north side of the building, and it is also warm in the winter when it exits through the same north outlet.
- the ASHP could be supplemented with a heat sink (Thermal Store) for storing heat absorbed by the ASHP from ambient air flowing from the said port from or to the HRU; heat energy stored in this heat sink could be used to heat and provide hot water to a whole building of up to 120m 2 in size, or act as a supplement to a larger building's heat system.
- PV systems are generally more efficient the cooler they get; their electrical output is usually measured when the ambient temperature is 25°C; for every 1°C above this temperature a PV panel will lose approximately 0.5% efficiency - so on an averagely warm day the air temperature can easily reach 45°C, reducing the efficiency of the PV pane! by 10% (the same efficiency change applies below 25°C, so in winter or at low ambient temperatures PV panels are more efficient, but in winter there is less solar energy for the PV panels to convert to electricity).
- the PV system may comprise a flat panel array (such as a plurality of separate PV panels connected together in a flat structure, in which the adjoining edges of adjacent panels are joined so as to prevent airflow between the panels, for example), which is mounted so as to lie in or against but spaced from one of the walls or pitched slopes of the roof of the building, and so as to overlie, or surround, the port in the slope; the slope would preferably be the most southerly facing slope of those on the pitched roof.
- a flat panel array such as a plurality of separate PV panels connected together in a flat structure, in which the adjoining edges of adjacent panels are joined so as to prevent airflow between the panels, for example
- a Ground Source Heat Pump having a ground source, or collector, and in thermal communication with the heat sink, or a first GSHP in thermal communication with the ground collector and the heat sink and a second, relatively smaller GSHP in thermal communication with the first GSHP and a borehole (or ground source), the first and second GSHPs acting in cascade.
- the second GSHP stores heat or coolant in the borehole/ground source in summer ready for use to heat/cool the building at a later time, and the GSHP can be powered by the PV array.
- the air leaving the building will be slightly cooler than ambient, and this air can be used to cool the PV array, making the PV array more efficient and so produce further energy.
- the system enables the fluid in the ground collector to be warmed up, this will make the GSHP 30 to 40% more efficient.
- the inbound air In summer when air enters from the north the inbound air is cooled by circulating the fluid in the GSHP's ground collector through the same heat exchanger.
- a relatively small GSHP and large thermal store means the small GSHP can run for free powered by the solar PV array with the heat created free and stored for later use. Should the small GSHP not be of a sufficient size to heat the building than it can be in communication with the second GSHP and the ground source (such as one or more boreholes) acting in cascade.
- the second GSHP only comes on when there has not been enough energy (or heat) stored in the thermal store. Further, the air leaving the building will be much cooler than the air temperature under the PV array (which could be as much as 40 to 50°C), and this can be used to cool the PV array, making the PV array more efficient and so produce further energy.
- the invention also provides a method of operating a MVHR system for a building, the system comprising a Heat Recovery Unit (HRU) for receiving and exchanging heat between a flow of ambient air from outside the building and a flow of building air from within the building, the method comprising switching the flows of air between a first state in which ambient air flows from a first port to the HRU and into the building and building air flows from the HRU to a second port to be exhausted from the building, and a second state in which ambient air flows from the second port to the HRU and into the building and building air flows from the HRU to the first port to be exhausted from the building, wherein the method comprises locating the first and second ports on different parts of the the building (e.g. walls or pitched roof slopes), which parts face in different directions.
- HRU Heat Recovery Unit
- Figure 1 shows a domestic house 2 equipped with a typical MVHR system; the house has a pitched roof having two pitched slopes, one slope 4 on a northerly facing side of the house and a second slope 6 on the opposite, southerly facing side of the house.
- the MVHR system comprises a Heat Recovery Unit HRU which is connected by air flow ducting 8 to a port 10 on the north slope 4 of the roof, and by air flow ducting 12 to a port 14 on the south slope 4 of the roof. Arrows in the drawing show the air flows within the MVHR system.
- the HRU is provided with fans to draw warm, humid air from the kitchen, bathroom and toilet in the house and to exhaust this outbound air through conduit 8 and port 10 out of the house.
- Air passageways or ducts 16 are provided to direct the flows of air inside the house.
- Fans in the HRU also draw fresh, ambient air (inbound air) from outside the house, through port 14 and conduit 12 and into the bedrooms and living room in the house.
- the HRU also includes heating/cooling means (not shown) for heating or for cooling the inbound air so that it enters the living room and bedrooms at a comfortable temperature.
- the HRU is configured such that the flows of inbound and outbound air pass each other, usually in opposite directions, in an arrangement which facilitates heat exchange between the two air flows; this heat exchange arrangement is intended to supplement the means for heating or cooling the inbound air and thus reduce overall energy usage (although note that all MVHR systems have a bypass operable in summer to avoid warm air leaving the house from heating the air entering; this summer bypass is usually actuated when the air temperature entering the unit reaches 18°).
- ambient air around port 14 is likely to be at a higher temperature than ambient air surrounding port 10 in northerly slope 4; as inbound air passes through the HRU, it is warmed further by heat exchange with the warm outbound air leaving the kitchen, bathroom and toilet, thus reducing the energy required to bring the temperature of this inbound air to the desired comfortable level to be blown into the living room and bedrooms.
- the air which enters through port 14 is likely to be much warmer than the air surrounding port 10, and is probably also warmer than the air to be exhausted from within the house; whilst this inbound air can be cooled to an extent through heat exchange in the HRU, it will need to be cooled further by the heating/cooling means to bring it to a temperature which is comfortable to the house's occupants. Because the inbound air is drawn from the warmer, southern side of the house it will require more energy to cool it than would be required if the inbound air were drawn from the cooler, northern side of the house.
- MVHR systems in accordance with the invention are predicated on the concept of reversing the air flows in only a part of the system.
- a flow diverter 20 is located in the air flow ducting 8, 12 between the HRU and the ports 10, 14. Inbound air is drawn in through the port 10 on the northern slope 4 of the roof, flows along the ducting 8, through the flow diverter 20 and the HRU and into the house via internal passageways 16. Stale air is drawn into the passageways from the kitchen, bathroom and toilet and flows to the HRU, through the flow diverter 20 and the ducting 12 to exhaust from the port 12 on the southern slope 6 of the roof.
- the air to the north of the roof is cooler than the air to the south, so the heating/cooling unit has less work to do to reduce the temperature of the air pumped into the house to what is desirable/comfortable for occupants of the house (compared to drawing inbound air through port 12).
- inbound air is drawn in through the port 14 on the southern slope 6 of the roof, flows along the ducting 12, through the flow diverter 20 and the HRU and into the house via internal passageways 16.
- Stale air is drawn into the passageways from the kitchen, bathroom and toilet and flows to the HRU, through the flow diverter 20 and the ducting 8 to exhaust from the port 10 on the northern slope 4 of the roof.
- the air to the south of the roof is warmer than the air to the north, so the heating/cooling unit has less work to do to increase the temperature of the air pumped into the house to what is desirable/comfortable for occupants of the house (compared to drawing inbound air through port 10).
- the system can ensure that the MVHR system is operating at its optimum efficiency for the temperature at any particular time.
- setting an ambient temperature of 16° C as the threshold so that the flow diverter changes the air flows as the ambient temperature increases or reduces past that temperature, represents a simple threshold which is suitable for homes in the climate of the United Kingdom.
- Other threshold temperatures may be appropriate in other climates, as will be understood by those skilled in the art.
- FIG. 3 shows how the present invention can provide yet further advantages; the house 2 is shown in winter, with the flow diverter arranged so that inbound air flows in through port 14 on the warm slope 6 to the south of the house and outbound air is exhausted form the port 10 on the opposite side of the roof.
- a solar photovoltaic (PV) array 22, comprising one or more panels is mounted to the slope 6, so as to capture the maximum amount of solar energy. Air in the gap 24 between the PV array 22 and the roof slope 6 is still, being sheltered from wind, etc.
- PV photovoltaic
- the temperature difference between the air trapped in the gap 24 and that further away from the house can be as much as 20° C), and this "pre-warming" of the inbound air not only adds to the energy saving of the heating means, it also helps lower the temperature of the panels in the PV array 22, which increases the efficiency at which they transform radiant energy into electrical power, which is very advantageous.
- the flow diverter could be directed to reverse the flow of air through the MVHR system, so that inbound air is drawn through the northerly port 10 and relatively warm outbound air is exhausted via the port 14 beneath the PV array; this warm air heats the PV array 22 and melts the snow resting on top of the PV array. The flow is diverted in this way until the snow is cleared.
- Operation of the MVHR system in this way to clear snow could be manually actuated, possibly with the flow being diverted for a predetermined time before it reverts to the flow arrangement of Figure 4 , or it could be automatic, with sensors to detect the presence of snow on the PV array (this could be done by knowing that it was daylight (using a separate daylight sensor, or a clock, for example) but sensing that the PV array was not generating electricity; if this situation arose in summer, the system could actuate a warning message, in winter it could be assumed that the PV array is covered by snow and/or ice, and the clearance process described above actuated).
- FIG 4a shows the system of Figure 3 with the addition of an Air Source Heat Pump (ASHP) 26 to recover heat energy from the outbound air before it leaves the building.
- ASHP Air Source Heat Pump
- the air flow ducting 8 to the north side of the house is split into two parts, 8' and 8", so that the outbound air flows through the ASHP 26.
- the ASHP acts to remove heat energy from the outbound air in the known manner, so that the outbound air is exhausted at a temperature much closer to ambient outside temperature; the extracted heat energy may be released inside the building, as hot water-filled radiators, underfloor heating and/or domestic hot water supply, etc., or it can be conducted to a heat sink 28 where it is stored for future use.
- the working fluid from the ASHP to the heat sink circuit 30 is circulated by a single pump 32 that moves the hot water produced by the ASHP to the heat sink which, most advantageously, is powered with electricity from the PV array 22.
- a single pump 32 that moves the hot water produced by the ASHP to the heat sink which, most advantageously, is powered with electricity from the PV array 22.
- the pump 32 can be powered from another source.
- the ASHP will come on automatically when the PV array is producing more power than the house is using and storing it for later, or if the ASHP is designed to heat the house as well and if there is not enough stored free heat, it will come on when there is a heat or hot water demand in the property.
- Figure 4b shows the system of Figure 4a operating in summer.
- the flows in the air flow ducting 8, 12 is reversed compared to Figure 4a , so inbound air is drawn in through the air flow ducting 8", 8' on the cooler north side passes through the ASHP 26, then the flow diverter 20, the HRU and into the house.
- the ducting 8', 8" is reversed as it leads into the ASHP. This is because the flow through the ASHP must always be in the same direction for the ASHP to function. This reversal of the ducting is described further below, in connection with Figures 6 and 7 .
- the ASHP Through its refrigerant cycle when heating the hot water or heat sink, the ASHP extracts heat energy from the already cool air on the north side of the house to cool it a little more, and the heating/cooling means in the HRU cools the inbound air to the desired degree before it is pumped into the building.
- the outbound air flows through the HRU, the flow diverter 20 and the air flow ducting 12 to exit the building into the gap 24 between the southern slope of the roof and the PV array. Because this air is cooler than the ambient air, this cools the rear of the PV array, thereby enabling it to operate more effectively and providing further efficiency.
- the system can incorporate a conventional ground source heat pump (GSHP - not shown, but as is known a GSHP system would usually comprise an underground fluid circuit, or ground collector, for exchanging heat between a heat transfer fluid and the ground outside the house, a pump for pumping the heat transfer fluid around the fluid circuit and a heat exchanger located within the house (adjacent to, integral with or instead of heat sink 28) and communicating with the fluid circuit for exchanging heat, directly or via another transfer fluid, with the ambient air within the house with the transfer fluid).
- GSHP ground source heat pump
- the system with a GSHP is capable of cooling the home all summer via the MVHR or a fan unit or even using chilled ceilings, but it can cool the property whether the GSHP is running or not so the home can have constant background comfort cooling 24 hours a day.
- the system helps re-charge the GSHP ground collector with the waste warm air that is leaving the house. This is especially effective when the solar PV is working and the system is collecting heat from underneath the solar PV array.
- the warming of the ground collector makes the GSHP much more efficient by raising the temperature of the fluid in the ground collector, and the warmer this fluid gets the more efficient the overall system becomes.
- the ASHP 26 shown in Figures 4a and 4b acts as a heat exchanger (or is replaced by a heat exchanger) which is in thermal communication through the transfer fluid in the heat sink circuit 30 to the heat sink 28, but via a ground source heat pump (GSHP - not shown).
- GSHP ground source heat pump
- the GSHP creates chilled fluid which runs through the heat exchanger which then cools the incoming air (thus cooling the building), it also cools the fluid in the ground collector itself.
- the air leaving will be slightly cooler than usual, and this can be ducted under the PV array, cooling it and thereby increasing its efficiency by 10 to 15%.
- the system helps recharge the ground collector with heat energy from the warm waste air leaving the house.
- the size or extent of the ground collector for the GSHP can be reduced; where the ground collector is in the form of a number of boreholes, it has been found that the number and/or depth of the boreholes can be reduced, by an extent which reduces the construction cost of the ground collector by an amount equal to or more than the cost of the MVHR system.
- Figures 5a to 5d are four perspective views of the flow diverter 20 of Figures 2 to 4 .
- Figure 5a is an external view of the flow diverter
- Figure 5b shows the flow diverter with the top plate removed
- Figure 5c shows the flow diverter with both the top plate and the cylindrical casing removed to show the inner workings of the flow diverter
- figure 5d shows the inner vane mechanism.
- the flow diverter is generally airtight and comprises a generally cylindrical casing 50 which is closed at its ends by a top plate 52 and a bottom plate 54 (shown in Figure 5c ).
- a vane mechanism 60 which comprises a fixed frame portion 62 and a rotatable vane 64; the fixed frame portion 62 is mounted fixedly to the interior of the casing 50 and the top and bottom plates 52, 54.
- the upper part of frame 62 runs between the four ports 56a-d so as to separate them into two pairs (shown as 56a and 56d in one pair, and 56b and 56c in the other pair).
- Vane 64 is rotatable about spindle 66 between a first position in which it is parallel to frame 62 and a second position in which it is perpendicular to frame 62; the arrangement is substantially airtight at both positions to ensure the flow of air is as intended, but during movement in between these end positions it is not completely airtight, instead there is a small gap (about 5mm or less) between the edges of the vane 64 and the cylindrical casing 50 and top and bottom plates 52, 54 so that the air does not restrict the vane from moving freely (because a small amount of air can flow around the edges of the vane 64 as it moves) and so that any minor damage, dents, etc. to the flow diverter do not impede the movement of the vane.
- Movement of the vane is actuated by mechanism 58, which rotates the vane back and forth under the control of an automatic controller (not shown) which is responsive to the input desired temperature within the house (which can be set by way of a thermostat, or other similar device) and the external ambient temperature.
- an automatic controller not shown
- the vane taking about 20 seconds to move between positions. In the first position, where vane 64 lies against and parallel to frame 62, air can only flow between port 56a and 56d, and between port 56 b and port 56 c. In the second position, where vane 64 is rotated so as to be perpendicular to frame 62 (as clearly shown in Figures 5c and 5d ), air can only flow between port 56a and port 56b, and between port 56c and port 56d.
- the flow diverter can change the flow directions in air flow ducting 8, 12 without affecting the air flow directions in the other parts of the MVHR system.
- the flow diverter is in effect a 4/2 directional control valve, however the large volume within the casing 50 is advantageous over a plain valve because this volume acts as a noise attenuating plenum, preventing noise from the MVHR system from leaking outside the building, and preventing noise from the flow diverter from entering the building.
- the flow diverter would be insulated, internally and externally, to reduce noise and condensation.
- the flow diverter 20' has a different arrangement of inlet and outlet ports 56a' to 56d' (they are arranged around the circumferential casing 50, rather than on the top plate 52) but otherwise the unit 68' in Figure 6b is the same as the unit 68 in Figure 6a , and they operate in the same manner.
- the ASHP has a built in fan (not shown) that sucks and blows the air through the unit 68, 68' so it does not rely on the air flow generated by the MVHR to work.
- the flow diverter 20, 20' together with the transition drum 70 ensures that the air entering the ASHP always enters through port 72 and leaves through port 74.
- Figures 7a and 7c show the unit 68 in the summer setting, and Figure 7b shows the unit 20 in the winter setting; the curved arrows show the direction of the air flows through the unit.
- the transition drum 70 is divided internally into separate chambers by baffles B, the chambers occupying one half 76 of the transition drum 70, and two quadrants 78, 80; one chamber 78 has a port 82 directly under the port 56a of the flow diverter 20 which leads to the MVHR. This port 82 is directly over the inlet port 72 of the ASHP, so the air always enters the ASHP no matter which side of the roof the air is coming in from, north or south, this is done automatically as the flow diverter 20 switches.
- the other quadrant chamber 80 is empty, and may contain control electronics for the system.
- the half chamber 76 has two ports 84, 86 beneath ports 56c and 56d respectively.
- the port 84 has a one-way valve ensuring the air being removed does not mix when the unit is in the summer setting and the ASHP is off.
- the volumes in chambers 76 and 82 adds to the plenum effect described above in connection with the flow diverter 20.
- the flow diverter ports 56a-d could be located on the cylindrical casing 50 rather than on the top plate 52.
- the casing need not be cylindrical: for some applications, particularly in an installation for a large, commercial building, it would be simpler and easier to fabricate the flow diverter with a square or rectangular casing. With such a rectangular casing the rotating vane would seal against the top and bottom of the casing as the vane rotates, but it would only seal at its rotating edge at one of its end positions; this should not be problematic and would not adversely affect air flows provided the vane rotation is reasonably quick.
- the system could be used in a building with a flat roof, but this would require the air ports to be located such that the air in their vicinity was likely to be at different temperatures, such as by mounting them on different sides of the building (the air ports could not be on the roof, since being flat the air above this would be all at the same temperature).
- not all of these ports need be located on the pitched roof; there may be more suitable locations in some situations, such as on soffits or under eaves, or even close to the ground. Moreover, it could be sufficient in some situations for the inlet and outlet ports to face in the same direction - where one is in shade and the other in full sunlight, for example.
- the system may be automatically controlled so as to switch flow direction at one temperature when the ambient temperature is rising, and to switch flow direction again at a second temperature different from the first temperature when the outside temperature is falling. Alternatively there may be just a single threshold temperature at which the actuator mechanism 58 is prompted to move the vane between the two positions.
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Claims (15)
- Système de récupération de chaleur par ventilation mécanique (MVHR) pour un bâtiment (2) ayant au moins deux grandes surfaces extérieures (4, 6) orientées dans des directions différentes, le système MVHR comprenant une unité de récupération de chaleur (HRU) pour recevoir et échanger de la chaleur entre un écoulement d'air ambiant provenant de l'extérieur du bâtiment (2) et un écoulement d'air de bâtiment provenant de l'intérieur du bâtiment (2), la HRU étant reliée par des conduits d'écoulement de fluide (8, 12) à des premier et deuxième orifices (10, 14) situés sur deux surfaces différentes (4, 6) des au moins deux grandes surfaces extérieures orientées dans des directions différentes, caractérisé en ce qu'un déflecteur d'écoulement (20) est prévu dans les conduits (8, 12) entre la HRU et les orifices (10, 14), le déflecteur d'écoulement (20) pouvant être commuté entre un premier état dans lequel de l'air ambiant s'écoule depuis le premier orifice (10) jusqu'à la HRU et jusque dans le bâtiment (2) et de l'air de bâtiment s'écoule depuis la HRU jusqu'au deuxième orifice (14) en vue d'être évacué du bâtiment (2), et un deuxième état dans lequel de l'air ambiant s'écoule depuis le deuxième orifice (14) vers la HRU et jusque dans le bâtiment (2) et l'air de bâtiment s'écoule depuis la HRU jusqu'au premier orifice (10) en vue d'être évacué du bâtiment (2).
- Système MVHR selon la revendication 1, dans lequel le déflecteur d'écoulement (20) est prévu pour commuter simultanément les écoulements d'air ambiant et d'air de bâtiment entre le premier et le deuxième état.
- Système MVHR selon la revendication 1 ou 2, dans lequel le déflecteur d'écoulement (20) comprend un tambour généralement cylindrique (50) ayant quatre orifices (56a, 56b, 56c, 56d) permettant à l'air de s'écouler, situés sur au moins une face d'extrémité (52) du tambour (50), le tambour (50) contenant une ailette rotative (64), les orifices (56a-d) étant disposés de telle sorte que la rotation de l'ailette (64) à l'intérieur du tambour (50) commute les écoulements d'air entre le premier et le deuxième état, ou vice versa.
- Système MVHR selon l'une quelconque des revendications précédentes, comprenant un capteur pour déterminer la température ambiante à l'extérieur du bâtiment (2), et un dispositif de commande prévu pour commuter le déflecteur d'écoulement (20) du premier état au deuxième état lorsque la température ambiante dépasse une première température seuil.
- Système MVHR selon la revendication 4, dans lequel le dispositif de commande est prévu pour commuter le déflecteur d'écoulement (20) du deuxième état au premier état lorsque la température ambiante est inférieure à une deuxième température seuil.
- Système MVHR selon l'une quelconque des revendications précédentes, comprenant en outre une pompe à chaleur à source d'air (ASHP - 26) dans le conduit de fluide (8', 8'') entre l'un des orifices (10) et le déflecteur d'écoulement (20) pour échanger de la chaleur entre l'air ambiant et l'air de bâtiment.
- Système MVHR selon la revendication 6, comprenant en outre un puits de chaleur (28) pour stocker la chaleur absorbée par l'ASHP à partir de l'air ambiant s'écoulant depuis ledit orifice (10) jusqu'à la HRU.
- Système MVHR selon la revendication 6 ou 7, comprenant en outre un système de puissance photovoltaïque solaire (PV- 22) pour alimenter l'ASHP.
- Système MVHR selon l'une quelconque des revendications 6 à 8, comprenant un moyen pour inverser temporairement les écoulements d'air s'écoulant à travers le système MVHR.
- Système MVHR selon l'une quelconque des revendications 6 à 9, comprenant en outre un moyen d'orientation (70) destiné à faire en sorte que les écoulements d'air à travers l'ASHP restent dans la même direction indépendamment de l'état du déflecteur d'écoulement (20).
- Système MVHR selon la revendication 10, dans lequel le déflecteur d'écoulement (20), l'ASHP et le moyen d'orientation (70) forment une seule unité (68).
- Système MVHR selon l'une quelconque des revendications précédentes, comprenant en outre au moins une pompe à chaleur à source terrestre (GSHP - 82, 84).
- Système MVHR selon la revendication 12, comprenant en outre un puits de chaleur, et dans lequel une première GSHP (82) est en communication thermique avec le puits de chaleur (28) et une deuxième GSHP relativement plus petite (84) est en communication thermique avec la première GSHP (82) et avec un trou de forage (ou une source terrestre), la première et la deuxième GSHP (82) étant prévues pour agir en cascade.
- Bâtiment (2) ayant un toit avec au moins deux versants inclinés (4, 6) qui forment les surfaces principales dans lesquelles sont situées la première et la deuxième surface, le bâtiment (2) comprenant un système MVHR selon la revendication 11, la revendication 12 ou la revendication 13, dans lequel le système PV comprend un groupe de panneaux plats (22) qui est monté de manière à s'appliquer contre l'un desdits versants inclinés (6) du toit du bâtiment (6) mais de manière espacée par rapport à celui-ci, et de manière à recouvrir l'orifice (14) dans le versant.
- Procédé pour faire fonctionner un système MVHR pour un bâtiment (2), le système comprenant une unité de récupération de chaleur (HRU) pour recevoir et échanger de la chaleur entre un écoulement d'air ambiant provenant de l'extérieur du bâtiment et un écoulement d'air de bâtiment provenant de l'intérieur du bâtiment, le procédé comprenant le fait de commuter les écoulements d'air entre un premier état dans lequel de l'air ambiant s'écoule depuis un premier orifice (10) jusqu'à la HRU et jusque dans le bâtiment et de l'air de bâtiment s'écoule depuis la HRU jusqu'à un deuxième orifice (14) en vue d'être évacué du bâtiment, et un deuxième état dans lequel de l'air ambiant s'écoule depuis le deuxième orifice (14) jusqu'à la HRU et jusque dans le bâtiment et l'air de bâtiment s'écoule depuis la HRU jusqu'au premier orifice (10) en vue d'être évacué du bâtiment, le procédé comprenant le positionnement des premiers et deuxièmes orifices (10, 14) sur des parties différentes du bâtiment (2), lesdites parties étant orientées dans des directions différentes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1704509.7A GB2560728A (en) | 2017-03-22 | 2017-03-22 | Mechanical ventilation heat recovery apparatus |
Publications (2)
Publication Number | Publication Date |
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EP3379164A1 EP3379164A1 (fr) | 2018-09-26 |
EP3379164B1 true EP3379164B1 (fr) | 2019-06-19 |
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Application Number | Title | Priority Date | Filing Date |
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EP18162795.1A Active EP3379164B1 (fr) | 2017-03-22 | 2018-03-20 | Appareil de récupération de chaleur par ventilation mécanique |
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Country | Link |
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US (1) | US10598403B2 (fr) |
EP (1) | EP3379164B1 (fr) |
AU (1) | AU2018201921A1 (fr) |
GB (1) | GB2560728A (fr) |
Cited By (1)
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DE102019127414A1 (de) * | 2019-10-11 | 2021-04-15 | Ivan Mallinowski | Wegeventil und Verfahren zum Einstellen von Verbindungen |
Families Citing this family (7)
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CN209042495U (zh) * | 2018-09-13 | 2019-06-28 | 山东中瑞新能源科技有限公司 | 一种利用城市生活垃圾降解热量的复合热泵系统 |
US11274839B1 (en) * | 2018-09-21 | 2022-03-15 | Qc Manufacturing, Inc. | Systems and methods for controlling and adjusting volume of fresh air intake in a building structure |
CN109812918A (zh) * | 2019-03-20 | 2019-05-28 | 郑楷 | 一种建筑新风自然冷却系统 |
CN110567139B (zh) * | 2019-08-30 | 2021-02-26 | 珠海格力电器股份有限公司 | 光伏空调的限频及降频控制方法、装置及光伏空调 |
WO2021102026A1 (fr) | 2019-11-22 | 2021-05-27 | Qc Manufacturing, Inc. | Système de ventilateur aérateur multifonction adaptatif à fenêtre motorisée |
US20230349568A1 (en) * | 2020-02-27 | 2023-11-02 | Thinh Quoc Nguyen | Energy saving conditioner and heat supply method |
PL243404B1 (pl) * | 2020-04-24 | 2023-08-21 | Adamski Bartlomiej | Bezprzewodowy system wentylacyjny z rekuperacją |
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US4403731A (en) * | 1981-03-13 | 1983-09-13 | Electra (Israel) Ltd. | Integrated heat pump and heat storage system |
EP0536445A1 (fr) * | 1991-10-11 | 1993-04-14 | Ca Bygg Ab | Procédé pour chauffer ou refroidir à volonté l'air dans un bâtiment |
US6010113A (en) * | 1998-06-15 | 2000-01-04 | Honeywell, Inc. | Damper with fanning blades |
NL1020141C2 (nl) * | 2002-03-11 | 2003-09-12 | Level Energietech Bv | Tegen bevriezing bestendige warmtewisselaar. |
GB0622926D0 (en) * | 2006-11-16 | 2006-12-27 | Polypipe Building Products Ltd | A building system |
FR2954474A1 (fr) * | 2009-12-23 | 2011-06-24 | Regis Garoni | Maison d'habitation avec systeme de climatisation passive |
US20140202178A1 (en) * | 2011-06-30 | 2014-07-24 | Michael W. Trumbower | Multiple circuit cooling system |
DE102013100056B3 (de) * | 2013-01-04 | 2013-10-31 | AoTerra GmbH | Luftumverteilungsvorrichtung |
US20140360556A1 (en) * | 2013-06-10 | 2014-12-11 | SunEdison Energy India Private Limited | Methods and systems for temperature regulation of roof mounted and solar tracker mounted photovoltaic modules |
GB2521369B (en) * | 2013-12-17 | 2017-11-01 | Greenfield Master Ipco Ltd | Controlling heat exchange from refrigeration system to geothermal system |
DE102015201604A1 (de) * | 2015-01-30 | 2016-08-04 | Vaillant Gmbh | Luftverteilungssystem |
EP3150932A1 (fr) * | 2015-09-30 | 2017-04-05 | Arndt, Paul Riis | Refroidisseur d'air solaire |
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2017
- 2017-03-22 GB GB1704509.7A patent/GB2560728A/en not_active Withdrawn
-
2018
- 2018-03-16 AU AU2018201921A patent/AU2018201921A1/en not_active Abandoned
- 2018-03-16 US US15/923,846 patent/US10598403B2/en active Active
- 2018-03-20 EP EP18162795.1A patent/EP3379164B1/fr active Active
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DE102019127414A1 (de) * | 2019-10-11 | 2021-04-15 | Ivan Mallinowski | Wegeventil und Verfahren zum Einstellen von Verbindungen |
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EP3379164A1 (fr) | 2018-09-26 |
US10598403B2 (en) | 2020-03-24 |
AU2018201921A1 (en) | 2018-10-11 |
GB2560728A (en) | 2018-09-26 |
GB201704509D0 (en) | 2017-05-03 |
US20180274810A1 (en) | 2018-09-27 |
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